In the LISA and ET+CE bands, however, the signal takes a more complicated form and cannot be described by a simple power law.
We, therefore, follow Ref. [1]} and bin the LISA sensitivity range for the signal to be well approximated by a power-law within each bin. For each bin, then, we construct the PLS. As noticed in Ref. [1]}, this results in a degraded sensitivity wrt the PLS computed using the full frequency range. As can be seen, the PLS approach suggests that our signal could be reconstructed quite faithfully also in these ranges of frequencies. An interesting consequence is that if a ground-based experiment ever measures the SGWB of this model, we could tell it apart from PBH scenarios with peaked mass functions. Indeed, the latter gives rise to a SGWB, which typically shows a bump in the frequency range of ground-based detectors, see e.g. Refs. [3]}, [4]}, [5]}, [6]}, [7]}, [8]}.
